Gloria Marie Steinem (; born March 25, 1934) is an American journalist and social-political activist who emerged as a nationally recognized leader of second-wave feminism in the United States in the late 1960s and early 1970s.

Steinem was a columnist for New York magazine and a co-founder of Ms. magazine. In 1969, Steinem published an article, "After Black Power, Women's Liberation," which brought her national attention and positioned her as a feminist leader. In 1971, she co-founded the National Women's Political Caucus which provides training and support for women who seek elected and appointed offices in government. Also in 1971, she co-founded the Women's Action Alliance which, until 1997, provided support to a network of feminist activists and worked to advance feminist causes and legislation. In the 1990s, Steinem helped establish Take Our Daughters to Work Day, an occasion for young girls to learn about future career opportunities. In 2005, Steinem, Jane Fonda, and Robin Morgan co-founded the Women's Media Center, an organization that "works to make women visible and powerful in the media."

As of May 2018, Steinem was traveling internationally as an organizer and lecturer, and was a media spokeswoman on issues of equality. In 2015, Steinem, alongside two Nobel Peace Laureates (Mairead Maguire of Northern Ireland and Leymah Gbowee of Liberia), Abigail Disney, and other prominent women peace activists, undertook a journey from the capital of North Korea, Pyongyang to South Korea, crossing the most heavily militarized zone in the world between the two Koreas.